Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa28bb54eb05ff1…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 06:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44d3970bf49e284090128e5890b12bc9 SHA-1: d4cc9d4552283935a0ade88addb1fe8739fc7de0 SHA-256: 7aa28bb54eb05ff1f2c1ca9f790cb641a879cb621fcf97904c12370dc0c87148
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host malicious files on potentially compromised infrastructure. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gopherandsquirrelcontrol.com/admin/images/file/43531784741.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da718fd5404---46258366357.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c57i38uq6ud0b23ejuu9il9bd3/7856633289.pdf
    • http://archerelectricsupply.com/userfiles/file/jugebugezevijezubi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095654961c61---61005806491.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/19328174114.pdf
    • http://amajyuku.com/files/files/9566656170.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9679824f10710488aaeb0990b834c286/67790273511.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b53b43723---xufog.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/39749955694.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607429510ef01---98972736146.pdf
    • http://arohitourandtravels.com/userfiles/file/64259333313.pdf
    • http://brandnewgoods.net/userfiles/file/zupebilavazira.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0134aaa10---kinerafijutul.pdf
    • http://insureacompany.com/userfiles/file/fibajisizuzodapezakis.pdf
    • https://kodcomputers.ro/2664/uploads/kotelebokamonare.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a858247ff8---40093856333.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/u2a0efinahhmpif1n2dqg5a099/lawasikuxazez.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b60cba41---84256704352.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kurexukewidisito.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/63bf55e09e0429d6b766f4eb545dfc77/3002829131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=reaction+time+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
font_01_sfnt_off0001142f.bin
2b696f48e360ad76551ef1dd21251253ef598d817ad48a312e3b0cdf8f688420
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10292 bytes
font_02_sfnt_off00012b5a.bin
453c1da33e112add747cc6c6a4c5bde7149f54c8f8eaea338f1f0b46810e2f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 17960 bytes